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Ch. 18 The Cardiovascular System: The Heart
Marieb - Human Anatomy & Physiology 7th Edition
Marieb, Hoehn7th EditionHuman Anatomy & PhysiologyISBN: 9780805359091Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMarieb, Hoehn 7th EditionCh. 18 The Cardiovascular System: The HeartProblema 8
Capitolo 17, Problema 8

Freshly oxygenated blood is first received by the:
a. Right atrium
b. Left atrium
c. Right ventricle
d. Left ventricle

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Understand the flow of blood through the heart: deoxygenated blood returns to the heart and is pumped to the lungs, while oxygenated blood returns from the lungs to the heart before being pumped to the body.
Recall that freshly oxygenated blood comes from the lungs via the pulmonary veins and enters the heart at the left atrium.
Identify the chambers of the heart: the right atrium and right ventricle handle deoxygenated blood, while the left atrium and left ventricle handle oxygenated blood.
Since freshly oxygenated blood is received first by the chamber that collects blood from the lungs, determine that this chamber is the left atrium.
Therefore, the correct answer corresponds to option b. Left atrium.

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Heart Chambers and Their Functions

The heart has four chambers: two atria and two ventricles. The atria receive blood entering the heart, while the ventricles pump blood out. Understanding which chamber receives oxygenated versus deoxygenated blood is essential to answer the question.
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Oxygenated vs. Deoxygenated Blood Flow

Oxygenated blood comes from the lungs and is rich in oxygen, while deoxygenated blood returns from the body with low oxygen. Knowing the path of oxygenated blood helps identify which chamber receives it first.
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Pulmonary and Systemic Circulation

Pulmonary circulation moves blood between the heart and lungs, delivering deoxygenated blood to the lungs and returning oxygenated blood to the heart. Systemic circulation sends oxygenated blood from the heart to the body. This distinction clarifies the flow of oxygenated blood into the heart.
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Describe the location and position of the heart in the body.

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The fact that the left ventricular wall is thicker than the right reveals that it:

a. Pumps a greater volume of blood

b. Pumps blood against greater resistance

c. Expands the thoracic cage

d. Pumps blood through a smaller valve

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The refractory period of cardiac muscle is much longer than that of skeletal muscle. Why is this a desirable functional property?

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In the heart, which of the following apply?

(1) Action potentials are conducted from cell to cell across the myocardium via gap junctions

(2) The SA node sets the pace for the heart as a whole

(3) Spontaneous depolarization of cardiac cells can occur in the absence of nerve stimulation

(4) Cardiac muscle can continue to contract for long periods in the absence of oxygen

a. All of the above

b. 1, 3, 4

c. 1, 2, 3

d. 2, 3

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The chordae tendineae:

a. The atrioventricular valves

b. Prevent the AV valve flaps from everting

c. Contract the papillary muscles

d. Open the semilunar valves

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